Blank and box made therefrom



Jan. 22, 1935. c. D. KNOWLTON 1,988,453

BLANK AND BOX MADE 'L'LHEREFROM Filed Sept. 8, 1930 Patented Jan. 22, 1935 v UNITED STATES PATENT" OFFICE?- 1,988,453 t BLANK AND BOXaMADE THEREFROM V Cutler D. Knowlton; Beverly, Mass., assignor "to Hoague-Sprague Corporation, Lynn, Mass., a

corporation of Massachusetts Application September 8, 1930, S eria l No. 480,517

9 Claims.

I This invention relates to box-blanks and boxes made therefrom, it being particularly concerned with the production of wall-boxes of pasteboard or similar shell-material which are brought to final form during their manufacture; The blanks may be made by the apparatus and method. disclosed in the aplication in my name for Letters ,Patent'of the United States, filed of even date herewith and bearing the Serial No. 480,518, while such blanks may be transformed into a cover or box-part by the apparatus and. method set forth in the application in my name filed in the United States Patent Oflice on July'l, 1930 and bearing the Serial No. 465,941.

The invention has as an object the provision of a blank from which may be formed a box-part both strong and'attractive in appearance. This object I attain by a blank of shell-materialhaving a body-portion and projecting wings with extensions, in the margins of which wings are spaces shown as in the outer portions of cornerlaps which furnish the extensions irom certain of the wings, and stays secured to the wing-margins and extending in loops over the spaces. In setting up, the blank, the marginal spaces will receive both the reinforcing stays and extensions from the wings between the corner-laps. This prevents the protrusion of the edges of the walls bearing these extensions. outside the plane of the edges of the otherwalls, and the forcing of the staymaterial into the spaces increases; its resistance to tearing by softening it; The efiiciency of the staysmay be increased by disposing them in the marginal spaces in plural thicknesses, as by plaitingor doubling them. The doubled stay may be caused to lie at those portions of the blank which, in theset-up part, are most liable to rupture. r

A further object of the invention is to furnish a box-part possessing the characteristics of strength and symmetry'above indicated. To this end, the set-up part has walls projecting from its body-portion of shell-material, the walls being provided'with extensions which may be in the form of corner-laps, in the outer margins of which are spaces. The corner-laps are secured to thepintermediate walls, these last-mentioned walls being also provided'with extensions secured to thecorner-laps. To margins of the walls, preferablythose carrying the comer-laps, is attached stay-material extending over the spaces. The spaces in the corner-laps are occupied by both the'stay-material and the wingextensions, giving flush edges about the entire periphery of the box-part. The plaiting ordoubling of the stay over the junctures of} the side; wings and cornen-lapa-in the blank, results,-in the set-up box-part,=in; an increased resistance to breaking at the meeting lines betweenthe walls, or at the corners. In-thefinishedbox; part, the rough shell-material and. stays are hidden by cover-material. ,Thebody and walls are separated from each other by creases, and adjacent to these creases said body andwallsare displaced inwardly toform depressions and the 10 laminae of the shell-material separated while the box-part is in set-up form. Thus the corners are squared, the length of the walls-is shortened, and stresses generated in the creases during the folding of the blank are released, so saidwalls will remain more nearly. at right-anglesto the body. f "1"}1 The accompanying drawing shows a single embodiment of myinvention, a

' Fig. 1 being a broken perspective viewof the improved blank;

Fig. 2, an enlarged broken perspective" of a corner of said blank'; Y

. Fig. 3, a transverse section'on theilin'e III-HI of Fig. 2;,

Fig. 4, a broken perspective j'of my invention;

Fig-5, alike view, enlarged, of thecovemand Fig. 6, anenlarged section on thelline of Fig. 4. t

Referring to Figs. 1, 2 and 3, a blank 13 is illus-. trated which is especially adapted for. theformation of the cover-part of a box, though its features are also applicable to box-bodies, the differ- 35 ence being chiefiyone of proportion. This blank is shown as consisting of a principal integral layer of shell-material 10, which may be of pasteboard of substantial thickness, to whichfis. glued an inner lining-layer 12 and an'outer cover-layer 40 14, of such relatively thin material aspaper, co'ncealing both faces of the rough shell. Broadly, both of these finishing layersv may beconsi'dere'd as'cover-material. Further, there isov'er each longitudinal edge of the shell, beneath the-cover.- paper,a folded strengthening strip or stay 1,6, which may beoftough paper of the grade known as kraft. This may be glued to the opposite margins oi the shell, being looped over the edges. The blank. has acentral body-portion '18,- usually rectangular and elongated, from thelongitudinal edges of whichextendside wings 20,- 20,while from the intermediate. edges project end-wings 22, 22, creases 24 dividing theqside-wings and a s .2 t e n -Whi s mit e y-r. f om view of the cover nett n 1 the opposite extremities of the side-wings project lateral extensions or comer-laps 28, the meeting lines of which are defined by continuations of the creases 26, which continuations, however, are shown as somewhat offset inwardly at 27, so, when the cover is set up, the corner-laps will lie smooth- 1y within the end-wings, the latter furnishing the outer layers. :The'end-wings carry at their ends opposite the body-portion extensions 30, there being intermediate creases 32. All the creases 24, 26, 27 and 32 are preferably of the bead-type, in which the blank-materialis pinched into a groove or depression of general U form, the curved bottomof this groove coming upon the inside of the set-up cover. These creases facilitate the folding of the blank to cover-form without breaking of the constituent layers. In the pinching of the laminated material to'the fo'rih of aheadcrease, the forces applied separate or slip th'e laminae over one another at the sides of the groove, butleave themconhected at the bottomorcurved bar on and also wherethe sides of-the crease join theconnected'poiftibhs of the blank. When the blank 'wings areturn'ed in atright-anglesto the edd -tenant fi r'nish thecovenwalls, the connectedlamin f the creases resist the movement, ja d'stresses be set up-tending to restore the Wallsjotheir initial positions and causing them to bulge o twardly. This tendency I correct as t'vill later a'tppear. Separating the corner-laps fro -the end wings and their extensions are nar- -slo ts ;34, the ends 36 of which are rounded adjacentjto the creases 26; 27; The outer edges iifftl'ie 'corner-laps and immediately adjacentporti'ons ot the side-wing's are cutaway at 38, furiiish'ing 'spaces" or depressions to receive the endwing-eigtensions in the setting-up of the cover, "when these extensions are 1 turned about the creases 32 to be .s ecuredagainstthe inner faces of the cor'res'por'idi'ng end-wings and corner-laps. There results asymmetrical lower edge of the'setup cover lying in a' single plane. The cover-material 14iss1itat40 along the slot 34adj'acent to the inner edge of "each corner-lap,"and theportion projectingbeyond the edge of the adj acentend- 'wihg and its extensionis' tucked through the slot ,and the r folded over and glued to's'ai'dend'wing and extension'at'42. "Thisis to conceal the raw edge of the shell material at the corner'of the eoverartr the'blank' has been set up. The loops of the stays l 6, befo re the application of the coverpaper whichiedncealstheiniaiedep'ressed into the eut 'out marginal portibns38f of the shell, preferablyito' form a 'centralgroove 44 with pl'aitshf the stay-material j'atfeabh side. These depressions double the numberof layers of the outer "portion of each stay, giving four thicknesses. instead of two, {and "increase proportionately, the ngth of that p'o'rtionbf each set-up cover hich is especially 'subjected .to strains; "The softening of staymate'rial of the character of kraft-paper by itsidepression'or crushing into the spaces 38 'in the shell is also advantageous, in that -a' b'r'eak in it is less liable. to 'startin somewhat flaccid material v at 'a localized point of weakness thanfin a: stiff sheet. In addition to these advantages, the stay-material isbetter disposed in the cutaway portions of the shell, 'to allow the receptio pf the end-wing-exten s'ions and to give the-desired 'fl'u'sh edge about; the entirecover.

Tlie's'tays '16 at the outer face of the blank'may lie 1 over substantially the entire i side wihgs and comer-ups andm turnedover the edge of the she -twmeet the lining-material 12, being here narrower thanat the opposite face. Folded-over down about-the creases 26 against the cornerlaps The walls and corner-laps having been positioned, the end-wing-extensions 30 are folded first in and thenup about the creases 32 until they contact with the inner faces of the cornerlafisth'idiidfivihgs. Glue having previously been applied'to-the chosen surfaces, as the inner sides of the end-wing-extensions, and to the portions or thend' wi1igs with which the corner-laps" are to'ctintact, ressure is exerted to 'both cause the adnesien 'of 'the' coated surfaces and to :perfect the former the cover. f In thisoper'ationQthe elements and relations'described in the previously meiit'ioned-applicationmay be employed; The cover, with 1 it's 'open side down, has within 5 it a form "about "which it "has-been folded, and "the top of this cover is-grasped between said form and an uppe'r abutment-plate, the area of the latter being somewhat less than that'of'the' upper facefof the cover. The side-walls of the cover are resting upon ledges so its downward movement is'prevente'd. -Theseledges may be upon *"walls which are inovable inwardly toward the form. Between the end-walls of the cover and theforhi' arespaces in]whichat this-point in the operation, are pressure-receiving hooks, 1 eppos'ite which, conta'ct'ing "with the outer faces of the end walls, "are movable pressure-applying 'abut'rnents. *Wi-th'theledgesand the 'end. pressure a members holding the cover-walls against downward moveinent 'the form-and I upper plate descend together-with the cover-top clamped" be- "tween' them. -'-Ihe-'creases,-'however, are outside *the engaged area both between the plate, the oks and the 5 pressure-applying abutmentsf or ibetween' the plate, the form and the side-walls. They re,-"there'fore, free for a limited displaceh ent under the-influence of the descent of the pIate-and form. 'The'elements engaging the wa'lls mayfpe so "desigiied as'to displace'these walls "semewnat inward-1y. 'Ihe efiect of this is-to upset the creases, those por'tions which were" at the 'bbttom or inside of each crease groove being 'forcedpiit at 50, while the outside of the groove, how at'theihterior of the cover; displaced inwardly at 52. This elfectively sepa'rates the lamina, thereby releasing the strains due to their conii'ectiedahd Set 1 11) in romin'g. v This" relieves "the walls from distorting forces-which cause them to how outwardly. -"At' the same time, the pressure creates depressions at 54'over the top' of the cover and at 56 along'each wall between the cor- 'n'ers. This' has the eiTect of squaring the corners so there will"be' no tendency to overstrain -and rupture said walls. 7

In the set-up cover; the; notches 38 in' the shellniaterial"are"atthe lower' or outer'edges' ofthe "earner-laps} and, since the "stay inaterial 16 has been depressed into these spaces, they are adapted to receive the turned-over end-wing-extensions 30, which complete the end-formations of the cover. Consequently, the edges of the walls about the entire cover lie in a single plane, giv ing symmetry to the article. The rough shellmaterial and the reinforcing stays are entirely hidden by the lining-material 12 and the covermaterial 14, the latter being folded over the edges of the end-wings at 42 and the side-wings at 46, concealing the shell at these points. At the outer portions 58 of the corners, which, in such containers as shoe-cartons, receive the most severe strains in use, the structure not only receives reinforcement of the looped stays, as do the intermediate portions of the side-walls, but, further, after these stays are doubled in thickness by the plaits at opposite sides of the groove 44, the corners are correspondingly strengthened. This furnishes a cover which offers effective resistance to breakage at all vital points. In addition to their strengthening function, the double stays secured to the entire length of the side-walls stiffen these and increase their resistance to bulging.

Having described my invention, what I claim' as new and desire to secure by Letters Patent of the United States is:

1. A blank for a box-part having a body-portion of shell-material, Wings projecting from the body-portion, corner-laps projecting from the extremities of opposite wings, extensions from the intermediate wings, there being depressions in the outer edges of the corner-laps and adjacent portions of the wings, and stay-material attached to the wingand corner-lap-margins and extending in loops over the depressions in said wings and corner-laps and lying in plaits in said depressions.

2. A box-part having a body-portion of shellmaterial, side-walls and end-walls projecting from the body-portion, the side-walls having extensions furnishing corner-laps adhesively secured to the endwalls, there being in the outer margins of the corner-laps and adjacent margins of the side-wall depressions, extensions from the end-walls occupying the depressions and adhesively secured to the inside of the corner-laps, and stay-material adhesively attached to the opposite margins of the side-walls and their corner-laps and extending in loops over their edges, the loops within the depressions in the sidewalls and corner-laps being disposed in plaits.

3. A blank for a box-part having a body-portion of shell-material, wings projecting therefrom, opposite wings having lateral extensions and the intermediate opposite wings having endextensions, the extensions being separated from the wings by creases, there being depressions in the outer edges of the lateral extensions and in the adjacent portions of the wings, and staymaterial adhesively attached in a loop to the inner and outer margins of each wing carrying the lateral extensions, this stay-material lying within both the extensionand Wing-portions of the depressions.

4. A blank for a box-part having a body-portion of shell-material, wings projecting therefrom, opposite wings having lateral extensions and the intermediate opposite wings having endextensions, the extensions being separated from the wings by creases, there being depressions in the outer edges of the lateral extensions and in the adjacent portions of the wings, and stay-material adhesively attached in a loop to the inner and outer margins of each wing carrying the lateral extensions, this stay-material being crushed into the depressions and thereby rendered more flaccid and resistive to rupture at the creases between the wings and their lateral extensions.

5. A blank for a box-part having a body-portion of shell-material, wings projecting therefrom,. opposite wings-having lateral extensions and the intermediate opposite wings having endextensions, the extensions being separated from the wings by creases, there being depressions in the outer edges of the lateral extensions and in the adjacent portions of the wings, and staymaterial adhesively attached in a loop to the inner and outer margins of each wing carrying the lateral extensions, this stay-material being forced into the depressions to lie in layers exceeding in number those of a loop.

6. A box-part having a body-portion of shell-,

material, sideand end-walls projecting from the body-portion, corner-1aps furnished by lateral extensions of the side-walls and adhesively secured to the inside or the end-walls, the cornerlaps and adjacent portions of the side-walls having spaces along their outer margins, and staymaterial adhesively attached in a loop to the opposite sides of each side-wing and its corner-laps and lying in the spaces, each end-wall being provided with an extension occupying the space outside the stays and secured to the inside of the corner-laps, the turned-over edges of the endwall-extensions and the edges of the side-walls lying in substantially the same plane.

7. A box-part having a body-portion of shellmaterial, sideand end-walls projecting from the body-portion, corner-laps furnished by lateral extensions of the side-walls and adhesively secured to the inside of the end-walls, the cornerlaps and adjacent portions of the side-walls having spaces along their outer margins, and staymaterial adhesively attached in a loop to the opposite sides of each side-wing and its corner-laps and being crushed into the spaces to give at the box-corners a softened reinforcement resistive to rupture, each end-wall being provided with an extension occupying the space outsidethe stays and secured to the inside of the corner-laps, the turned-over edges of the end-wall-extensions and the edges of the side-walls lying in substantially the same plane.

8. In a pasteboard box produced by bending an integral blank including a laminated paper shell member of substantial thickness, a corner-construction wherein adjacent walls have been displaced inwardly after the box is in set-up form, thereby producing wall-depressions and eliminating stresses within the material or" the cornerconstruction, which stresses would tend to cause the walls to bulge outwardly.

9. In a pasteboard box produced by bending a creased integral blank of laminated shell-ma- 

